<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图-->
    <el-card>
      <!--提示区域-->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false">
      </el-alert>
      <!--步骤条区域-->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本属性"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!--tab栏区域-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number" type="number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-form-item>

          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的Item项-->
            <el-form-item :label="item.attr_name" v-for="item in manyTableDate" :key="item.attr_id">
              <!--复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableDate" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--富文本编辑器-->
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <!--添加商品的按钮-->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!--图片预览-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'
  export default {
    data() {
      return {
        //商品分类列表
        cateList: [],
        activeIndex: '0',
        //添加商品的表单数据对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          //商品所属的分类数组
          goods_cat: [],
          //图片的数组
          pics:[],
          //商品的详情描述
          goods_introduce:'',
          attrs:[]
        },
        addFormRules: {
          goods_name: [
            {required: true, message: '请输入商品名称', trigger: 'blur'},
          ],
          goods_price: [
            {required: true, message: '请输入商品价格', trigger: 'blur'},
          ],
          goods_weight: [
            {required: true, message: '请输入商品重量', trigger: 'blur'},
          ],
          goods_number: [
            {required: true, message: '请输入商品数量', trigger: 'blur'},
          ],
          goods_cat: [
            {required: true, message: '请输入商品分类', trigger: 'blur'},
          ]
        },
        cateProps: {
          expandTrigger: 'hover',
          label: 'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        //动态参数列表数据
        manyTableDate: [],
        //静态属性列表数据
        onlyTableDate: [],
        //上传图片的URL地址
        uploadURL: 'http://timemeetyou.com:8889/api/private/v1/upload',
        //图片上传组件的headers请求头对象
        headerObj: {
          Authorization:
            window.sessionStorage.getItem('token')
        },
        previewPath:'',
        previewVisible:false

      }

    },
    created() {
      this.getCateList()
    },
    methods: {
      //获取所有商品数据
      async getCateList() {
        const {data: res} = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类数据失败')
        }
        this.cateList = res.data
        console.log(this.cateList)
      },
      //级联选择器选择项变化，会触发这个函数
      handleChange() {
        console.log(this.addForm.goods_cat)
        if (this.addForm.goods_cat.length !== 3) {
          this.addForm.goods_cat = []
        }
      },
      beforeTabLeave(activeName, oldActiveName) {
        if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类')
          return false
        }
      },
      async tabClicked() {
        //证明访问的是动态参数面板
        if (this.activeIndex === '1') {
          const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {
              params: {sel: 'many'}
            }
          )
          if (res.meta.status !== 200) {
            return this.$message.error('获取动态参数列表失败')
          }
          console.log(res.data)
          res.data.forEach(item => {
            item.attr_vals =
              item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableDate = res.data
        } else if (this.activeIndex === '2') {
          const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {
              params: {sel: 'only'}
            })
          if (res.meta.status !== 200) {
            return this.$message.error('获取静态属性列表失败')
          }
          console.log(res.data)
          this.onlyTableDate = res.data
        }

      },
      //处理图片预览效果
      handlePreview(file) {
        console.log(file)
        this.previewPath =
          file.response.data.url
        this.previewVisible = true
      },
      //处理移除图片的操作
      handleRemove(file) {
        console.log(file)
        //1.获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        //2.从pics数组中，找到这个图片对应的索引值
        const i =
        this.addForm.pics.findIndex(x =>
        x.pic === filePath)
        //3.调用数组的splice方法把图片信息对象，从pics数组中移除
        this.addForm.pics.splice(i,1)
        console.log(this.addForm)
      },
      //监听图片上传成功的事件
      handleSuccess(response){
        console.log(response)
        //1.先拼接得到一个图片信息对象
        const picInfo = {pic:response.data.tmp_path}
        //2.将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)
        console.log(this.addForm)
      },
      add(){
        this.$refs.addFormRef.validate(async valid =>{
          if (!valid){
            return this.$message.error('请填写必要的表单项')
          }
          //执行添加的业务逻辑
          //lodash cloneDeep(obj)
          const form = _.cloneDeep(this.addForm)
          form.goods_cat= form.goods_cat.join(',')
          //处理动态参数
          this.manyTableDate.forEach(item =>{
            const newInfo ={attr_id:item.attr_id,
            attr_value:item.attr_vals.join(' ')}
            this.addForm.attrs.push(newInfo)
          })
          //处理静态属性
          this.onlyTableDate.forEach(item =>{
            const newInfo = {attr_id:item.attr_id,
              attr_value:item.attr_vals}
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          console.log(form)

          //发起请求添加商品
          //商品名称必须是唯一的
          const {data:res} = await this.$http.post('goods',form)
          if (res.meta.status !== 201){
            return this.$message.error('添加商品失败')
          }
          this.$message.success('添加商品成功')
          this.$router.push('/goods')
        })
      }
    },
    computed: {
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style lang="less" scoped>
  .el-checkbox {
    margin: 0 10px 0 0 !important;
  }
  .previewImg{
    width: 100%;
  }
  .btnAdd{
    margin-top: 15px;
  }
</style>
